Frame Synchronization of a Photonic Network of Time Multiplexed Space Switches via a Feedback Scheme.

A method for frame synchronization in a photonic network of time multiplexed space switches is presented. The proposed method is an extension of a feedback scheme which was originally introduced for a configuration containing a single photonic switch. Methods for extending the feedback scheme have been presented both for hierarchical (tree topology) and non- hierarchical (general topology) configurations. The methods presented here require additional electronics at the switches, but electronics only for control purposes, not in the path of the information bits. However, optical delay elements are needed in the path of information bits on some links of the network. The proposed schemes also reduce the amount of synchronization equipment needed, compared to other methods. These are attractive features of the schemes presented here, but this memorandum only addresses the logical (topological), not practical, feasibility of such schemes. Further work is needed to address the technical and economical issues related to the feasibility and desirability of such methods.